TL431BQDBVRG4 Equivalent & Substitute Parts

Part Overview

The TL431BQDBVRG4 is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable voltage regulation applications. This component operates with an adjustable output range of 2.495V to 36V, delivering up to 100mA output current with ±0.5% tolerance. The device is packaged in SOT-23-5 (SC-74A) surface mount configuration and operates across the industrial temperature range of -40°C to 125°C.

The TL431BQDBVRG4 is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications utilizing this reference voltage IC.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	TL431BQDBVRG4
Category	Power Management (PMIC)
Reference Type	Shunt
Output Type	Adjustable
Voltage Output Range	2.495V to 36V
Output Current	100 mA
Tolerance	±0.5%
Cathode Current	700 µA
Operating Temperature	-40°C to 125°C
Package Type	SOT-23-5 (SC-74A, SOT-753)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the TL431BQDBVRG4 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Parameters:

Reference type (Shunt)
Output type (Adjustable)
Output voltage range compatibility (minimum 2.495V to 36V)
Output current capability (100 mA minimum)
Package type (SOT-23-5)
Operating temperature range (-40°C to 125°C)
Tolerance specification (±0.5% or better)

Acceptable Variation Parameters:

Cathode current (700 µA nominal; variations acceptable within design margins)
Temperature coefficient (not specified for main part; variations acceptable)
MSL rating (1 or 3 acceptable for surface mount applications)

The substitute parts identified maintain electrical compatibility through matching output voltage ranges, current ratings, and package specifications. Tolerance differences are noted where they occur.

Parameter Comparison

Parameter	TL431BQDBVRG4 (Main)	TL431BQDBVR (Substitute)	AS431BKTR-G1 (Substitute)
Manufacturer	Texas Instruments	Texas Instruments	Diodes Incorporated
Product Status	Obsolete	Active	Active
Reference Type	Shunt	Shunt	Shunt
Output Type	Adjustable	Adjustable	Adjustable
Voltage Output (Min)	2.495V	2.495V	2.5V
Voltage Output (Max)	36V	36V	36V
Output Current	100 mA	100 mA	100 mA
Tolerance	±0.5%	±0.5%	±1%
Cathode Current	700 µA	700 µA	1 mA
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Package Type	SOT-23-5	SOT-23-5	SOT-23-5
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

TL431BQDBVR (Texas Instruments)

This part is the direct successor to the TL431BQDBVRG4. It maintains identical electrical specifications including ±0.5% tolerance, 2.495V minimum output voltage, and 700 µA cathode current. The primary difference is product status: TL431BQDBVR is active and currently in production, ensuring long-term availability. Both parts carry ROHS3 compliance and MSL-1 rating. This substitute is recommended as the primary replacement for obsolete stock management and new design implementations.

AS431BKTR-G1 (Diodes Incorporated)

This part provides functional equivalence with the following considerations: it maintains the same output voltage maximum (36V), output current (100 mA), and operating temperature range. The AS431BKTR-G1 differs in tolerance specification (±1% versus ±0.5%), minimum output voltage (2.5V versus 2.495V), and cathode current (1 mA versus 700 µA). The part is active and in production. MSL rating is 3 (168 hours) versus MSL-1 for the original part. This substitute is suitable for applications where ±1% tolerance is acceptable and where the higher cathode current does not create design constraints.

Both substitute parts are ROHS3 compliant and operate across the required industrial temperature range.

Frequently Asked Questions (FAQ)

Q: Can TL431BQDBVR directly replace TL431BQDBVRG4 without circuit modification?

A: Yes. TL431BQDBVR maintains identical electrical specifications including output voltage range (2.495V to 36V), output current (100 mA), tolerance (±0.5%), and cathode current (700 µA). Both use SOT-23-5 packaging. No circuit modifications are required.

Q: What is the key difference between TL431BQDBVR and AS431BKTR-G1?

A: The primary differences are tolerance (±0.5% versus ±1%), minimum output voltage (2.495V versus 2.5V), cathode current (700 µA versus 1 mA), and MSL rating (1 versus 3). Both maintain the same maximum output voltage (36V), output current (100 mA), and operating temperature range. AS431BKTR-G1 is suitable where ±1% tolerance is acceptable.

Q: Are all substitute parts in the same package?

A: Yes. TL431BQDBVRG4, TL431BQDBVR, and AS431BKTR-G1 all use SOT-23-5 (SC-74A, SOT-753) surface mount packaging. Pin-to-pin compatibility is maintained.

Q: What does MSL rating mean for these parts?

A: MSL (Moisture Sensitivity Level) indicates the maximum time a component can be exposed to moisture before soldering. TL431BQDBVRG4 and TL431BQDBVR carry MSL-1 (unlimited storage). AS431BKTR-G1 carries MSL-3 (168 hours maximum). For standard manufacturing environments with proper storage, all three parts are suitable.

Q: Is the higher cathode current of AS431BKTR-G1 a concern?

A: The AS431BKTR-G1 cathode current is 1 mA versus 700 µA for the original part. This difference affects bias network design. Applications designed for 700 µA operation should use TL431BQDBVR to maintain identical performance. AS431BKTR-G1 is suitable for new designs where the higher cathode current is accommodated in the bias network.

Q: Are all parts RoHS compliant?

A: Yes. TL431BQDBVRG4, TL431BQDBVR, and AS431BKTR-G1 are all ROHS3 compliant.

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